JPH03206424A - Liquid crystal display element - Google Patents
Liquid crystal display elementInfo
- Publication number
- JPH03206424A JPH03206424A JP175590A JP175590A JPH03206424A JP H03206424 A JPH03206424 A JP H03206424A JP 175590 A JP175590 A JP 175590A JP 175590 A JP175590 A JP 175590A JP H03206424 A JPH03206424 A JP H03206424A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- transparent electrode
- crystal display
- display element
- metal film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 57
- 239000011521 glass Substances 0.000 claims abstract description 28
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims description 31
- 239000002184 metal Substances 0.000 claims description 31
- 239000011241 protective layer Substances 0.000 claims description 22
- 239000000126 substance Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- 238000007747 plating Methods 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000007772 electroless plating Methods 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241000617482 Kiwa Species 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 229920006287 phenoxy resin Polymers 0.000 description 1
- 239000013034 phenoxy resin Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 210000003296 saliva Anatomy 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 229920006230 thermoplastic polyester resin Polymers 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、ディスプレイ分野に利用できる液晶表示素子
に関するものであり、詳述するならば、液晶表示素子に
おける外部接続用透明電極を保護し信頼性を向上した液
晶表示素子に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid crystal display element that can be used in the display field, and more specifically, to protect and improve reliability of transparent electrodes for external connection in a liquid crystal display element. This invention relates to an improved liquid crystal display element.
従来の技術
近年、液晶表示素子はドットマトリックス型液晶表示素
子に代表されるように大容量表示化とともに、特に高信
頼性化、高品位化の要求が強くなっている。この中にあ
って従来の液晶表示素子は第３図に示されるように、一
対の透明電極４ａ，４ｂを形成したガラス基板１ａ，ｌ
ｂを微少な間隙をもって相対向させ、このガラス基板１
ａ，ｌｂの周辺にシール部３を形成し、前記間隙中に液
晶物質２を封入したものである。一般的には、前記ガラ
ス基板１ａには前記透明電極４ａが外方に延び外部接続
用透明電極４ａ′として庇状に形成されている。BACKGROUND OF THE INVENTION In recent years, liquid crystal display elements, as typified by dot matrix type liquid crystal display elements, have been required not only to display larger capacities, but also to have particularly high reliability and high quality. Among these, a conventional liquid crystal display element has glass substrates 1a and 1 on which a pair of transparent electrodes 4a and 4b are formed, as shown in FIG.
b facing each other with a small gap, and this glass substrate 1
A seal portion 3 is formed around the points a and lb, and a liquid crystal substance 2 is sealed in the gap. Generally, the transparent electrode 4a extends outward from the glass substrate 1a and is formed in the shape of an eave as a transparent electrode 4a' for external connection.
第４図は第３図の液晶表示素子の一部を示す拡大斜視図
であり、前記のような外部接続用透明電極４ ａ ／は
複数にわたり引き出され、この外部接続用透明電極４
ａ ／を通じて、前記透明電極４ａ，４ｂに電圧を印加
し液晶表示素子を駆動させるものである。FIG. 4 is an enlarged perspective view showing a part of the liquid crystal display element in FIG.
A voltage is applied to the transparent electrodes 4a and 4b through the transparent electrodes 4a and 4b to drive the liquid crystal display element.
発明が解決しようとする課題
前記のような構成の液晶表示素子においては、外部接続
用透明電極４ａ′の接続部分以外の大部分は露出状態に
なっている。一般に、透明電極４ａ，外部接続用透明電
極４ａ’ に使用される透明導電膜は酸化物であるため
乾燥大気中では安定であるが、水分が存在すると分解し
易くさらに電圧を印加すると電解腐食あるいは、隣接間
ショートによる過大電流のために透明導電膜の断線が生
ずることや、金属クズなどの導電性ゴミや汗，だ液など
イオン性汚物が付着し、ショートや腐食の原因になるな
ど、液晶表示素子としての品質、長期的信頼性に欠ける
大きな問題を有していた。特にこの問題は、液晶表示素
子が大容量表示化（大型化）する傾向がある近年におい
ては当然のこととして液晶の駆動電圧も高くなり６０℃
，９０〜９５％Ｒ−Ｈ等の高湿度雰囲気中においては５
０時間で断線に至るなど致命的な問題であった。この対
策として、前記の外部接続用透明電極４ａ′上に無電解
めっき法などによりニッケルめっき、あるいはニッケル
めっきした上に、さらに金めっきすることにより金属皮
膜を施した構造が見られる。この場合、透明電極表面の
わずかな汚染等があれば、透明電極表面はめっき皮膜が
均一、かつ完全に被覆されず多数のピンホールが発生す
る問題がある。さらには、透明電極の膜厚が通常３００
人〜２０００人であり極めて薄いために、厚み方向、す
なわち、透明電極の側面においては、めっき皮膜の密着
が非常に悪い状態で形成されるなどの問題があり、前記
のように水分の存在などによりめっき皮膜のピンホール
や、透明電極とめっき皮膜との界面から水分が侵入し、
電圧を印加することによって６０℃．９０〜９５％Ｒ−
Ｈ雰囲気中では、２００時間程度で電解腐食が生じ断線
に至るなど恒久的な対策にはなっていない。その他の対
策として、前記外部接続用透明電極４ａ′上に導電性ペ
ーストをスクリーン印刷法などにより形成する方法もあ
るが、この方法では液晶表示素子における液晶物質２を
封入するためのシール部３のきわまでに印刷を施すこと
が困難であり、導電性ペーストとシール部３との間に導
電性ペーストによって完全に被覆できない部分（すき間
）が生じるため、前記のような６０℃．９０〜９５％Ｒ
−Ｈ雰囲気中では、１５０時間程度で、すき間部分に電
解腐食が生じ、断線に至るため完全な対策にはなってい
ない。Problems to be Solved by the Invention In the liquid crystal display element configured as described above, most of the external connection transparent electrode 4a' other than the connecting portion is exposed. In general, the transparent conductive film used for the transparent electrode 4a and the transparent electrode 4a' for external connection is an oxide and is therefore stable in a dry atmosphere, but is easily decomposed in the presence of moisture and may cause electrolytic corrosion or corrosion if a voltage is applied. , the transparent conductive film may break due to excessive current due to short circuit between adjacent parts, and conductive dirt such as metal scraps and ionic impurities such as sweat and saliva may adhere to the liquid crystal display, causing short circuits and corrosion. This had a major problem in that it lacked quality and long-term reliability as a display element. In particular, this problem has arisen as liquid crystal display elements have tended to display larger capacities (larger sizes) in recent years, and as a matter of course, the drive voltage for liquid crystals has also increased to 60°C.
, 5 in a high humidity atmosphere such as 90-95% R-H.
This was a fatal problem, as the wire broke at 0 hours. As a countermeasure against this problem, there is a structure in which a metal film is formed by nickel plating or gold plating on top of nickel plating by electroless plating or the like on the transparent electrode 4a' for external connection. In this case, if there is slight contamination on the surface of the transparent electrode, there is a problem in that the surface of the transparent electrode is not coated uniformly and completely with a plating film, and many pinholes occur. Furthermore, the film thickness of the transparent electrode is usually 300 mm.
Since it is extremely thin and has a thickness of ~2,000 people, there are problems such as the plating film being formed with very poor adhesion in the thickness direction, that is, on the side surfaces of the transparent electrode, and as mentioned above, the presence of moisture etc. This causes moisture to enter through pinholes in the plating film and the interface between the transparent electrode and the plating film,
60℃ by applying a voltage. 90-95% R-
In an H atmosphere, electrolytic corrosion occurs after about 200 hours, leading to wire breakage, so there is no permanent countermeasure. As another countermeasure, there is a method of forming a conductive paste on the external connection transparent electrode 4a' by a screen printing method, etc., but in this method, the seal part 3 for sealing the liquid crystal substance 2 in the liquid crystal display element is It is difficult to print extremely precisely, and there is a portion (gap) between the conductive paste and the seal portion 3 that cannot be completely covered by the conductive paste. 90-95%R
In a -H atmosphere, electrolytic corrosion occurs in the gap after about 150 hours, leading to wire breakage, so this is not a perfect countermeasure.
本発明はこのような課題を解決するものであり、液晶表
示素子において一方のガラス基板に突出させた部分に形
成された透明電極（外部接続用透明電極４ａ′）の保護
を完全に達成し、高信頼性、高品位の液晶表示素子を提
供するものである。The present invention solves these problems, and completely protects the transparent electrode (external connection transparent electrode 4a') formed on the protruding part of one glass substrate in a liquid crystal display element. The present invention provides a highly reliable and high quality liquid crystal display element.
課題を解決するための手段
前記課題を解決するために本発明の液晶表示素子は、相
対向する面に透明電極を形成したガラス基板間に液晶物
質を充填するとともに、前記一方のガラス基板の外方に
突出させた部分に形成した前記透明電極上に金属皮膜か
らなる第１の保護層を形成し、さらにこの金属皮膜を熱
可塑性樹脂からなる第２の保護層で被った構成にしたも
のであり、さらに、前記の構威において、金属皮膜から
なる第１の保護層を、ガラス基板間に充填する液晶物質
を封止するためのシール部まで延長しテ形成した構成と
したものである。Means for Solving the Problems In order to solve the above problems, the liquid crystal display element of the present invention is provided by filling a liquid crystal substance between glass substrates having transparent electrodes formed on opposing surfaces, and filling a liquid crystal substance between glass substrates having transparent electrodes formed on opposite surfaces thereof. A first protective layer made of a metal film is formed on the transparent electrode formed on the portion protruding in the direction, and this metal film is further covered with a second protective layer made of a thermoplastic resin. Furthermore, in the above structure, the first protective layer made of a metal film is extended to a sealing portion for sealing the liquid crystal material filled between the glass substrates.
作用
この構或によれば、外方に延びた透明電極上に、金属皮
膜からなる第１の保護層が形成されたものであり、前記
透明電極（外部接続用透明電極）を予め、大まかに保護
したうえに、さらに熱可塑性樹脂からなる第２の保護層
が形成されているために、金属皮膜からなる第１の保護
層に発生しうる欠陥、例えば、ピンホール，付着むら（
未付着部），密着むら（浮き）等が部分的に発生しても
、完全に被覆された２重の保護構造をとったものであり
、湿気．ゴミなどを遮断でき、高湿度雰囲気中において
も透明電極が常に安定した状態を保持し、高信頼性、高
品質の液晶表示素子を得ることができる。特に、前記金
属皮膜からなる第１の保護層が、液晶物質を封止するた
めのシール部まで延長して形成させ、熱可塑性樹脂から
なる第２の保護層がシール部の外側（シール゛のきわ）
まで被うことにより、液晶表示素子の製造工程で発生し
うる微少のパターン精度ズレ及び２枚のガラス基板の貼
合せズレなどによる透明電極のわずかな露出部分が仮に
あっても、金属皮膜がシール部の真下にまで食い込んだ
状態で形成されているため、前記の湿気等に対して、い
っそう電解腐食防止効果が上がるものである。すなわち
、液晶表示素子の製造容易性から、外方ら突き出させる
ように形戊する透明電極外部接続用透明電極を有する一
方のガラス基板に、予め、外部接続用透明電極上に金属
皮膜を形成したのち、充填される液晶物質を封止するた
めのシール部を形成し、２枚のガラス基板を所定の間隙
を保持して貼合せしたのち、液晶物質を充填し、最後に
外部接続用透明電極上に第２の保護層である熱可塑性樹
脂を形成する工程であるため、外部接続用透明電極部分
（シール部の外側）のみに金属皮膜が形成されているた
め、シール部の外側が金属皮膜との境界において、ガラ
ス基板の貼合せ位置がズレた場合、わずかなから外部接
続用透明電極が露出した状態が考えられるためである。According to this structure, the first protective layer made of a metal film is formed on the transparent electrode extending outward, and the transparent electrode (transparent electrode for external connection) is roughly coated in advance. In addition to protection, since the second protective layer made of thermoplastic resin is formed, defects that may occur in the first protective layer made of metal film, such as pinholes and uneven adhesion (
Even if partial adhesion (unattached areas) or uneven adhesion (lifting) occurs, it has a double-layered protective structure that completely covers the moisture. It is possible to block dust and the like, and the transparent electrode always maintains a stable state even in a high humidity atmosphere, making it possible to obtain a highly reliable and high quality liquid crystal display element. In particular, the first protective layer made of the metal film is formed to extend to the seal portion for sealing the liquid crystal material, and the second protective layer made of thermoplastic resin is formed outside the seal portion (the seal portion). Kiwa)
Even if there is a slight exposed part of the transparent electrode due to slight deviations in pattern accuracy or misalignment of two glass substrates that may occur during the manufacturing process of liquid crystal display elements, the metal film will remain sealed. Since it is formed so as to penetrate right below the portion, the effect of preventing electrolytic corrosion against the above-mentioned moisture, etc. is further improved. That is, for ease of manufacturing a liquid crystal display element, a metal film was previously formed on the transparent electrode for external connection on one glass substrate having a transparent electrode for external connection formed so as to protrude from the outside. After that, a seal part is formed to seal the liquid crystal material to be filled, and the two glass substrates are bonded together with a predetermined gap, then the liquid crystal material is filled, and finally, a transparent electrode for external connection is formed. Since this is a process of forming a second protective layer of thermoplastic resin on top, a metal film is formed only on the transparent electrode part for external connection (outside of the seal part), so the metal film is formed on the outside of the seal part. This is because if the bonding position of the glass substrate shifts at the boundary between the two, the transparent electrode for external connection may be exposed, even if only slightly.
実施例
以下、本発明の一実施例を図面を用いて説明する。第１
図ａにおいて、ｌｌａ，ｌｌｂは液晶表示素子を構成す
る２枚のガラス基板であり、それぞれ透明電極１４ａ．
１４ａ’ ，１４ｂが形成され、ガラス基板１１ａには
前記透明電極１４ａ′が外部接続用透明電極１４ａ！と
じて外方に突出した状態（庇状）に露出している。なお
、１２は液晶物質、１３はシール部である。ｌ５は前記
外部接続用透明電極１４ａ′上に設けた金属皮膜であり
、外部接続用透明電極１４ａ′の第１の保護層である。EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In Figure a, lla and llb are two glass substrates constituting a liquid crystal display element, and transparent electrodes 14a, 14a, 14b, 14b, 14b, 14b, 14a, 14b, 14b, 14b, 14b, 14b, 14b, 14b, 14a, 14b, lla, llb are two glass substrates constituting a liquid crystal display element, respectively.
14a', 14b are formed, and the transparent electrode 14a' is formed on the glass substrate 11a as the external connection transparent electrode 14a! It is closed and exposed in an outwardly protruding state (like an eave). In addition, 12 is a liquid crystal substance, and 13 is a sealing part. 15 is a metal film provided on the transparent electrode 14a' for external connection, and is a first protective layer of the transparent electrode 14a' for external connection.
１６は前記金属皮膜１５上に設けた熱可塑性樹脂からな
る第２の保護層である。従って、前記外部接続用透明電
極１４ａ′上には、金属皮膜１５と熱可塑性樹脂１６の
２重の保護層が設けられている。以下、本発明の一実施
例による液晶表示素子の製造工程についてのべる。16 is a second protective layer made of thermoplastic resin provided on the metal film 15. Therefore, a double protective layer of a metal film 15 and a thermoplastic resin 16 is provided on the external connection transparent electrode 14a'. Hereinafter, a manufacturing process of a liquid crystal display element according to an embodiment of the present invention will be described.
まず、金属皮膜１５を一方のガラス基板の外方に突出さ
せるように形成した透明電極１４ａ′上に第１図ａのよ
うにシール部１３の真下に位置する。すなわち、シール
領域における内側部分までに、２枚のガラス基板１１ａ
．１ｌｂを貼合せる前に形成した。次いで、前記金属皮
膜１５を形成したガラス基板１１ａ上にシール部１３を
形成し、他方のガラス基板１ｌｂと所定の間隙（０．６
μｍ）を保持するように位置整合し、貼合せを行った。First, a metal film 15 is placed on a transparent electrode 14a' formed so as to protrude outward from one of the glass substrates, directly below the seal portion 13 as shown in FIG. 1A. That is, the two glass substrates 11a are
．． It was formed before laminating 1 lb. Next, a seal portion 13 is formed on the glass substrate 11a on which the metal film 15 is formed, and a predetermined gap (0.6
The positions were aligned so as to maintain the distance (μm), and lamination was performed.
次いで、前記金属皮膜１５を形成した外部接続用透明電
極１４ａ′が庇状をなすように不要なガラス基板部を除
去したのち２ Ｘ １ ０−”ＴＯｒｒの真空槽中で、
液晶物質１２を充填した。次いで、庇状に露出した外部
接続用透明電極１４ａ′と金属皮膜１５で構成される。Next, unnecessary glass substrate portions were removed so that the transparent electrode 14a' for external connection on which the metal film 15 was formed formed an eaves shape, and then in a vacuum chamber of 2×10-” TOrr.
A liquid crystal material 12 was filled. Next, it is composed of a transparent electrode 14a' for external connection exposed in the shape of an eave and a metal film 15.
接続用電極および前記接続用電極以外の余白部分を含む
全面に熱可塑性樹脂１６を形成し、液晶表示素子とした
。ここで、前記金属皮膜１５は本実施例では、シール部
１３の真下まで形成したが、これに限ることなく、第２
図のように金属皮膜１５とシール部１３の位置整合を確
実に行えば、本発明の効果に何ら支障をきたすものでは
ない。また、第１の保護層１５である金属皮膜として、
本実施例では、無電解めっき法により膜厚０．８μｍの
ニッケルめっき皮膜を形成した後、さらに無電解めっき
法により０．０５μｍの金めつき皮膜を形成したものを
用いたが、その他として、金，銀，銅，クロム，白金，
パラジウム，アルミニウム，半田等の単層皮膜、さらに
は多層皮膜，合金皮膜などを無電解めっき法，電解めっ
き法，スパッタリング法，蒸着法等を用いて形成した金
属皮膜なども有効である。また、第２の保護層１６であ
る熱可塑性樹脂として、本実施例では、熱可塑性ポリエ
ステル樹脂を用い、前記外部接続用透明電極１４ａ′上
に形成された金属皮膜ｌ５とを完全に覆うため、全面に
コーティングを行い保護層とした。その他、前記第２の
保護層１６として、アクリル，ポリビニルブチラール，
ポリスチレン等の熱可塑性樹脂、スチレンーブタジエン
共重合体ゴム等の熱可塑性ゴム、Ｂスラージ状樹脂（半
硬化状態であり熱によりいったん、熱軟化する樹脂）、
例えば、フェノール樹脂，エポキシ樹脂，フエノキシ樹
脂，工ゝポキシ変性フェノール樹脂，シリコン樹脂等の
、単体もしくは、前記樹脂群との混合物なども有効であ
る。A thermoplastic resin 16 was formed on the entire surface including the connection electrodes and the blank areas other than the connection electrodes to obtain a liquid crystal display element. Here, in this embodiment, the metal film 15 is formed right below the seal part 13, but the present invention is not limited to this.
As long as the metal coating 15 and the seal portion 13 are properly aligned as shown in the figure, the effects of the present invention will not be adversely affected. Moreover, as the metal film that is the first protective layer 15,
In this example, a nickel plating film with a thickness of 0.8 μm was formed by electroless plating, and then a gold plating film of 0.05 μm was further formed by electroless plating. gold, silver, copper, chromium, platinum,
Single-layer films of palladium, aluminum, solder, etc., as well as multi-layer films, alloy films, etc., formed using electroless plating, electrolytic plating, sputtering, vapor deposition, etc., are also effective. In addition, in this embodiment, thermoplastic polyester resin is used as the thermoplastic resin that is the second protective layer 16, and in order to completely cover the metal film l5 formed on the external connection transparent electrode 14a', The entire surface was coated as a protective layer. In addition, as the second protective layer 16, acrylic, polyvinyl butyral,
Thermoplastic resins such as polystyrene, thermoplastic rubbers such as styrene-butadiene copolymer rubber, B sludge-like resins (semi-cured resins that soften once heated),
For example, phenol resins, epoxy resins, phenoxy resins, epoxy-modified phenol resins, silicone resins, etc. alone or in mixtures with the above resin groups are also effective.
なお第１図ｂは、前記第１図ａにおけるＡ−Ａ’部分の
断面図であり、本実施例の製造工程で説明したように、
ガラス基板１１ａ上に形成した外部接続用透明電極１４
ａ′と、さらには、その上に形成した金属皮膜１５とか
ら構威される接続用電極、および、前記接続用電極以外
の余白部分を含む全面に熱可塑性樹脂からなる第２の保
護層ｌ６を形成した状態を示すものである。なお、第２
の保護層１６は、液晶表示素子を駆動させるために、駆
動用半導体素子を搭載したフレキシブル配線基板の銅箔
パターンの被接続部表面に異方導電性接着剤を設け、外
部接続用透明電極１４ａ′と金属皮膜１５とから構成さ
れる接続用電極との間で位置整合し、異方導電性接着剤
とともに熱圧着により溶融・排除されるため、接続上何
ら支障をきたすものではない（異方導電性接着剤中に混
合されている導電粒子が銅箔パターンと接続用電極間に
界在し電気的に接続される）。Note that FIG. 1b is a cross-sectional view of the AA' portion in FIG. 1a, and as explained in the manufacturing process of this embodiment,
Transparent electrode 14 for external connection formed on glass substrate 11a
a' and a metal film 15 formed thereon, and a second protective layer l6 made of thermoplastic resin over the entire surface including the blank area other than the connection electrode. This figure shows the state in which . In addition, the second
In order to drive the liquid crystal display element, the protective layer 16 is provided with an anisotropic conductive adhesive on the surface of the connected portion of the copper foil pattern of the flexible wiring board on which the driving semiconductor element is mounted, and the transparent electrode 14a for external connection. ' and the connection electrode composed of the metal film 15, and are melted and removed together with the anisotropic conductive adhesive by thermocompression bonding, so there is no problem in connection (anisotropic (The conductive particles mixed in the conductive adhesive intersect between the copper foil pattern and the connection electrode and are electrically connected.)
以上のようにして得た液晶表示素子の防湿効果を確認す
るために、前記液晶表示素子１０個について、それぞれ
印加電圧ＤＣ２５Ｖを印加しながら、６０℃，９０〜９
５％Ｒ−Ｈの高温高温雰囲気中に投入し、酎電食性試験
を行った。これにより得た結果を次の表に示した。In order to confirm the moisture-proofing effect of the liquid crystal display elements obtained as described above, the 10 liquid crystal display elements were heated at 60°C, 90 to 90°C while applying an applied voltage of 25 V DC to each of the 10 liquid crystal display elements.
It was placed in a high-temperature atmosphere of 5% R-H and subjected to electrolytic corrosion test. The results obtained are shown in the following table.
さらに比較例１，２として従来技術により液晶表示素子
を作製した。Further, as Comparative Examples 1 and 2, liquid crystal display elements were manufactured using conventional techniques.
比較例１
第４図に示すように２枚のガラス基板１ ａ， １ ｂ
にはそれぞれ透明電極４ ａ， ４ ｂを形成し、ガラ
ス基板１ａには、前記透明電極４ａが外方に突出した状
態で形成させ、外部接続用透明電極４ａ’として庇状に
露出させ、液晶表示素子を作成した。Comparative Example 1 As shown in FIG. 4, two glass substrates 1 a and 1 b
Transparent electrodes 4a and 4b are formed on the glass substrate 1a, respectively, and the transparent electrode 4a is formed on the glass substrate 1a so as to protrude outward, and is exposed in an eaves shape as a transparent electrode 4a' for external connection. A display element was created.
比較例２
比較例２として、比較例１における液晶表示素子の透明
電極４ａが外方に突出した状態で形成された外部接続用
透明電極４ ａ ／上に、本実施例と同様に、予め０．
８μｍ厚のニッケルめ゛っき皮膜を形成した後、さらに
０．０５μｍ厚の金めつき皮膜を形成したものを液晶表
示素子とした。Comparative Example 2 As Comparative Example 2, a transparent electrode 4a for external connection, which is formed with the transparent electrode 4a of the liquid crystal display element in Comparative Example 1 protruding outward, is coated with 0 in advance in the same way as in this example. ．．
After forming a nickel plating film with a thickness of 8 μm, a gold plating film with a thickness of 0.05 μm was further formed to obtain a liquid crystal display element.
これら比較例１，２において本実施例と同様に、それぞ
れ液品表示素子１０個づつについて、酎電食性試験を行
った。これにより得た結果を次の表に示した。In Comparative Examples 1 and 2, the electrolytic corrosion test was conducted on 10 liquid display elements each in the same manner as in the present example. The results obtained are shown in the following table.
表
前記表に示すとおり、本実施例における液晶表示素子は
、耐電食性試験において、電食断線不良は全く発生しな
かった。Table As shown in the table above, the liquid crystal display element in this example did not have any electrical corrosion disconnection defects in the electrical corrosion resistance test.
発明の効果
以上のように構成した液晶表示素子は、ガラス基板上に
形成し、外方に突出させた状態をなす外部接続用透明電
極上に金属皮膜と熱可塑性樹脂からなる保護層を２重に
した構成であるため、前記外部接続用透明電極の耐湿性
、防塵性を著しく向上することができるとともに、この
液晶表示素子を駆動させるための半導体素子の電気的接
続においても、熱可塑性樹脂が全面にコーティングされ
ているため接続強度の向上と電気的接続信頼性の向上を
図ることができる。さらには、液晶表示素子におけるク
ロストーク防止のために、抵抗値を低減する目的で、透
明電極上に金属皮膜を形成する試みも、従来は、電食断
線が完全に防止できなかったが、本発明の構成により達
成できるなど液晶表示素子として高信頼性、高品位のも
のが得られるなど極めて工業的価値の大なるものである
。Effects of the Invention The liquid crystal display element constructed as described above is formed on a glass substrate, and has a double protective layer made of a metal film and a thermoplastic resin on a transparent electrode for external connection that projects outward. Because of this structure, the moisture resistance and dust resistance of the transparent electrode for external connection can be significantly improved, and thermoplastic resin is also used for the electrical connection of the semiconductor element for driving this liquid crystal display element. Since the entire surface is coated, it is possible to improve connection strength and electrical connection reliability. Furthermore, in order to prevent crosstalk in liquid crystal display elements, attempts have been made to form a metal film on transparent electrodes for the purpose of reducing the resistance value, but conventionally, it has not been possible to completely prevent electrical corrosion and disconnection. The structure of the invention can achieve high reliability and high quality liquid crystal display elements, which is of great industrial value.
第１図ａは本発明の一実施例の液晶表示素子の部分断面
図、第１図ｂは同第１図ａのＡ−Ａ’断面図、第２図は
他の実施例の部分断面図、第３図は従来の液晶表示素子
の部分断面図、第４図は従来の液晶表示素子の部分拡大
斜視図である。
１１ａ，ｌｌｂ・・・・・・ガラス基板、１２・・・・
・・液晶物質、１３・・・・・・シール部、１４ａ．１
４ｂ・・・・・・透明電極、１４ａ′・・・・・・外部
接続用透明電極、１５・・・・・・金属皮膜、１６・・
・・・・熱可塑性樹脂。FIG. 1a is a partial sectional view of a liquid crystal display element according to an embodiment of the present invention, FIG. 1b is a sectional view taken along line AA' in FIG. 1a, and FIG. 2 is a partial sectional view of another embodiment. 3 is a partial sectional view of a conventional liquid crystal display element, and FIG. 4 is a partially enlarged perspective view of a conventional liquid crystal display element. 11a,llb...Glass substrate, 12...
...Liquid crystal substance, 13... Seal portion, 14a. 1
4b...Transparent electrode, 14a'...Transparent electrode for external connection, 15...Metal film, 16...
····Thermoplastic resin.
Claims (2)
に液晶物質を充填するとともに、前記一方のガラス基板
の外方に突出させた部分に形成した前記透明電極上に金
属皮膜からなる第１の保護層を形成し、さらにこの金属
皮膜を熱可塑性樹脂からなる第２の保護層で被ってなる
液晶表示素子。(1) A liquid crystal substance is filled between glass substrates having transparent electrodes formed on opposing surfaces, and a liquid crystal material made of a metal film is placed on the transparent electrode formed on the outwardly protruding portion of the one glass substrate. A liquid crystal display element in which a first protective layer is formed, and this metal film is further covered with a second protective layer made of a thermoplastic resin.
に充填する液晶物質を封止するためのシール部まで延長
して形成した請求項１記載の液晶表示素子。(2) The liquid crystal display element according to claim 1, wherein the first protective layer made of a metal film extends to a seal portion for sealing a liquid crystal substance filled between the glass substrates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP175590A JPH03206424A (en) | 1990-01-09 | 1990-01-09 | Liquid crystal display element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP175590A JPH03206424A (en) | 1990-01-09 | 1990-01-09 | Liquid crystal display element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03206424A true JPH03206424A (en) | 1991-09-09 |
Family
ID=11510397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP175590A Pending JPH03206424A (en) | 1990-01-09 | 1990-01-09 | Liquid crystal display element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03206424A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100384608B1 (en) * | 1999-08-27 | 2003-05-22 | 세이코 엡슨 가부시키가이샤 | Liquid crystal device |
| JP2012150580A (en) * | 2011-01-18 | 2012-08-09 | Panasonic Corp | Touch panel |
| JP2015129992A (en) * | 2014-01-06 | 2015-07-16 | 大日本印刷株式会社 | Touch panel sensor and method for manufacturing touch panel sensor |
-
1990
- 1990-01-09 JP JP175590A patent/JPH03206424A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100384608B1 (en) * | 1999-08-27 | 2003-05-22 | 세이코 엡슨 가부시키가이샤 | Liquid crystal device |
| JP2012150580A (en) * | 2011-01-18 | 2012-08-09 | Panasonic Corp | Touch panel |
| JP2015129992A (en) * | 2014-01-06 | 2015-07-16 | 大日本印刷株式会社 | Touch panel sensor and method for manufacturing touch panel sensor |
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